Possibilities for application of coal mining by rotary drilling at the opencast mine Gračanica-Gacko: Mogućnost primene eksploatacije uglja rotacionim bušenjem na površinskom kopu Gračanica-Gacko. (2011). Podzemni Radovi, 18, 77-83. https://ume.rgf.bg.ac.rs/index.php/ume/article/view/96